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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - UNAUDITED (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Other Comprehensive Income (Loss):        
Unamortized retirement costs, tax benefit (provision) $ 41 $ 596 $ (317) $ (3,121)
Unrealized loss on interest rate swaps, tax benefit $ 132 $ 365 $ 412 $ 814